<div class="content_index">
  <br>
  <span id="groups_and_artists">Группы и исполнители:</span>
  <br>
  <br>
  <br>
  <div class="groups_box">
    <span class="char">А</span>
    <br>
    <a href="list_text_song.php?groups_and_artists=Ария" class="a">Ария</a>
    <br>
    <a href="list_text_song.php?groups_and_artists=Агата Кристи" class="a">Агата Кристи</a>
    <br>
    <a href="list_text_song.php?groups_and_artists=Аквариум" class="a">Аквариум</a>
    <br><br><span class="char">Б</span>
    <br>
    <a href="list_text_song.php?groups_and_artists=Би-2" class="a">Би-2</a>
  </div>
  <div class="groups_box">
    <span class="char">В</span>
    <br>
    <a href="list_text_song.php?groups_and_artists=Визбор Юрий" class="a">Визбор Юрий</a>
    <br><br><span class="char">Л</span>
    <br>
    <a href="list_text_song.php?groups_and_artists=Любэ" class="a">Любэ</a>
  </div>
  <div class="groups_box">
    <span class="char">К</span>
    <br>
    <a href="list_text_song.php?groups_and_artists=Кино" class="a">Кино</a>
    <br>
    <a href="list_text_song.php?groups_and_artists=Король и Шут" class="a">Король и Шут</a>
  </div>
</div>